US7899311B1 - Removable shutter for a camera - Google Patents
Removable shutter for a camera Download PDFInfo
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- US7899311B1 US7899311B1 US12/432,458 US43245809A US7899311B1 US 7899311 B1 US7899311 B1 US 7899311B1 US 43245809 A US43245809 A US 43245809A US 7899311 B1 US7899311 B1 US 7899311B1
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- Prior art keywords
- camera
- wedge
- recited
- adaptor
- contact points
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/08—Shutters
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
- G03B37/04—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe with cameras or projectors providing touching or overlapping fields of view
Definitions
- the present invention pertains to components for a camera, including a camera shutter, specifically a replaceable camera shutter and other components assembled so as to reduce or eliminate the need for repeated recalibration or realignment when camera components are removed and replaced.
- airborne camera systems are known in the art. Such systems are used for aerial mapping, monitoring of natural resources, reconnaissance, and other activities. Although some of these systems are used in orbiting satellites, they are also used in airplanes that are especially equipped with stable rack arrangements to hold the cameras to obtain images that are as clear and detailed as possible.
- Shutters comprise several mechanical elements such as the motors and bearings that move the shutter over the aperture. Because these elements are subjected to rapid and repeated movement, they tend to wear down over time leading to shutter failure. Such failure often occurs in mid-operation as there is ordinarily no method of determining beforehand when shutter components are about to fail. This leads not only to a waste of time and resources caused by prematurely discontinuing an operation, but also extends downtime originating from removing the camera, shipping it to the OEM or a repair center, shipping the repaired camera back, and calibrating the camera to the whole system.
- the present invention broadly comprises a camera system having a removable shutter, the camera system comprising: a camera frame having at least one open side and defining at least two opposing camera frame orifices; an image receiving means releasably attached to the camera frame and positioned at least partly over the first of the two opposing camera frame orifices; an adaptor defining an adaptor orifice positioned around the second of the two opposing camera frame orifices and having three kinematic adaptor contact points, each of the three adaptor contact points having a different shape; at least one lens system, each of the at least one lens system having at least one lens, wherein each of the at least one lens system includes an attachment end having at least three attachment points for releasable attachment to the camera frame and positioned to at least partly cover the second opposing camera frame orifice; at least one wedge, each of the at least one wedge defining a wedge orifice and including three kinematic wedge contact points, each of the three kinematic wedge contact points having a shape complementary to an
- the present invention also broadly comprises a photographic imaging system comprising: a photographic imaging system comprising at least one global positioning sensor; at least one camera, each of the at least one cameras including a camera frame having at least one open side and defining at least two opposing camera frame orifices; an image receiving means releasably attached to the camera frame and positioned at least partly over the first of the two opposing camera frame orifices; an adaptor defining an adaptor orifice positioned around the second of the two opposing camera frame orifices and having three kinematic adaptor contact points, each of the at least three adaptor contact points having a different shape; at least one lens system, each of the at least one lens system having at least one lens, wherein each of the at least one lens system includes an attachment end having at least three attachment points for releasable attachment to the camera frame and positioned to at least partly cover the second opposing camera frame orifice; at least one wedge, each of the at least one wedge defining a wedge orifice and including three kinematic
- One object of the invention is to present a camera and photographic image system with a kinematic connection to resist changes in alignment and calibration caused by warping, contraction, expansion and twisting of the camera components.
- a second object of the invention is to provide a camera constructed and assembled to maintain calibration and alignment during removal and replacement of a camera shutter.
- a third object of the invention is to supply a camera having an athermal construction to allow calibration and alignment to be maintained during temperature change.
- An additional object of the invention is make available a camera in which a variety of different lens systems may be interchanged for use without the necessity of recalibration or realignment of the components of the camera.
- a further object of the invention is to provide a photographic imaging system configured to reduce downtime caused by component repair or replacement.
- a still further object of the invention is provide a photographic imaging system constituted to enable relatively rapid replacement of lens systems and shutter systems during operation of the system.
- FIG. 1A is a partially exploded side perspective view of the camera system of the present invention.
- FIG. 1B is a top view of the camera system of the present invention attached to a baseplate;
- FIG. 1C is a side view one of the kinematic adaptor-wedge contact points of the assembled camera system fastened to the baseplate with the camera lens extending through the baseplate;
- FIG. 1D is a different side view of the assembled camera system depicting the camera frame cover and a second kinematic adaptor-wedge contact point;
- FIG. 2 is an exploded top perspective view of the camera system of the present invention
- FIG. 3 is an enlarged top perspective view of the camera system of the present invention showing the attachment of the camera lens to the camera frame to enable alignment with the camera lens system with the several components of the system;
- FIG. 4 is a top perspective view of the camera system showing the removal and replacement of the shutter cassette from the camera frame and the kinematic connection between the wedge and the adaptor attached to the camera frame;
- FIG. 5 is a side perspective view of the shutter cassette removed from the camera system
- FIG. 5A is a front view of the shutter cassette
- FIG. 5B is a bottom view of the shutter cassette looking into the cassette cover
- FIG. 5C is a side view of the shutter cassette with the cover removed showing the shutter motor
- FIG. 6 is a schematic view of a photographic imaging system
- FIG. 7 depicts an array of cameras for the photographic imaging system arranged on a rack and aligned at different angles.
- FIG. 1A is a partially exploded side perspective view of camera system A (“camera A”) of the present invention.
- the shutter cassette 7 (“shutter 7 ”) of camera A is seen extending from the body of camera A.
- Camera frame 9 (“frame 9 ”) is positioned between image receiving means 8 and interface adapter 11 (“adaptor 11 ”) and acts as a shutter cassette receiver.
- lens system 15 (“lens 15 ”) has at least one lens and is attached to frame 9 through adaptor 11 using a three point attachment configuration at attachment end 15 b of lens 15 (not seen in FIG. 1 ) so as to easily remove and/or change lens 15 without recalibrating or realigning camera A.
- lens 15 is a 60 mm lens system, but it will be recognized by persons having skill in the art that other lens 15 having a substantially identical three point configuration at attachment end 15 b can also be used in camera A.
- Wedge 12 defines an orifice through which lens 15 extends when camera A is assembled. Wedge 12 is attached to adaptor 11 through a kinematic three contact point system described below. Assembled camera A is fastened to baseplate 28 .
- baseplate 28 is itself attached to a fixed airborne rack system or other assembly known in the art that allows camera A to be used in aerial photography, often with similar or different cameras. Alternatively, baseplate 28 may be attached directly to the airframe. Baseplate 28 also defines an orifice 28 a through which lens 15 extends.
- FIG. 1B is a top view of camera A attached to baseplate 28 .
- FIG. 1C is a side view of assembled camera A fastened to baseplate 28 with lens 15 extending through baseplate 28 .
- Seal 3 is a light-tight seal preventing light from entering through the shutter 7 .
- kinematic adaptor contact point a 1 on adaptor 11 in a releasable contact with kinematic contact point w 1 of wedge 12 to form part of the three point kinematic connection.
- the kinematic connection acts to maintain proper alignment of the components of camera A by countering torsion, warping, or other forces on camera A.
- FIG. 1D is a view of a different side of assembled camera A showing camera frame cover 13 and kinematic contact w 2 of wedge 12 .
- FIG. 2 is an exploded top perspective view of camera A.
- FIG. 2 depicts the insertion of shutter cassette 7 into one of two opposing open sides 9 a of frame 9 .
- Frame 9 also includes opposing frame orifices 9 b .
- This alignment configuration allows cassette 7 to be removed from camera A and replaced without the need for realigning the whole camera assembly.
- lens 15 Preferably guided by pin 25 , lens 15 includes three lens ears 15 a that fit through adapter cutouts 11 a of adapter 11 to frame 9 .
- Screws 23 fasten lens 15 to frame 9 through holes defined by lens ears 15 a and into holes defined by frame 9 so as to at least partly cover frame orifice 9 b .
- Shutter 7 is inserted into frame 9 and fastened thereto with screws 21 .
- Adapter 11 is then attached to camera frame 9 , preferably using screws. It is clear from FIG. 2 that shutter 7 can be removed from and attached to frame 9 without causing any misalignment of lens 15 or the other components of camera A
- a kinematic connection may be defined as the joining of two fixtures such that the joined contact points are designed or configured exactly to kinematically constrain the part in question.
- Each kinematic contact point has two individual contact subpoints for a total of six contact subpoints, enough to constrain all six of the part's degrees of freedom.
- Degrees of freedom are the set of independent displacements and/or rotations that specify completely the displaced or deformed position and orientation of the body or system.
- the kinematic connection may comprise three hemispheres on one part that fit respectively into a tetrahedral dent, a v groove, and a flat.
- kinematic coupling not seen here consists of three radial v-grooves in one part that each mate with three hemispheres in another. Both kinematic connections and the concept of degrees of freedom are well known to those having skill in the art.
- a single adaptor 11 may be fabricated with kinematic contact points a 1 , a 2 , and a 3 to form a kinematic connection with a plurality of wedges 12 each with kinematic contact points w 1 , w 2 , and w 3 in which each wedge 12 varies in thickness.
- diverse lenses 15 each having an attachment end 15 b with substantially the same ears 15 a , may be passed through the same adaptor cutouts 11 a to attach to the same holes in frame 9 .
- the matching ears 15 a on each different lens 15 provide the advantage of utilizing different lenses 15 to be used while eliminating the need for recalibration or realignment whenever one lens 15 is removed and a different lens 15 is attached to the same frame 9 through the same cutouts 11 a of the same adaptor 11 .
- lens 15 in FIG. 3 is shorter than lens 15 depicted in FIG. 2 .
- wedge 12 in FIG. 4 is narrower than as shown in FIG. 2 .
- a single camera system A may be adapted to a plurality of different length lenses 15 by combining each lens 15 with a suitable wedge 12 . It will be recognized by those having skill in the art that a similar system may be utilized using a wedge 12 and a plurality of different adaptors 11 having different widths.
- each wedge 12 -adaptor 11 pair may be fabricated as a unique combination such that each pair member only forms a kinematic connection when used with the other member.
- each wedge 12 and adaptor 11 may be given a serial number or other identifying mark to ensure the members of each unique pair are joined together.
- a unique or custom kinematic connection between wedge 12 and adaptor 11 may be made by “torque-fitting” wedge 12 contact points w 1 , w 2 , and w 3 with corresponding adaptor 11 contact points a 1 , a 2 , and a 3 .
- the contact points a 1 , a 2 , and a 3 are fabricated with a stainless steel, such as 416 stainless steel.
- the entire adaptor 11 is fabricated from stainless steel, as is camera frame 9 , while wedge contact points w 1 , w 2 , and w 3 , if not the whole of wedge 12 is produced from aluminum, such as 6061-T6 aluminum, which is softer than stainless steel.
- adaptor 11 or wedge 12 may be made from the harder material, it is preferable to have adaptor 11 made from the same material as camera frame 9 .
- Stainless steel bolts are used to attach wedge 12 and adaptor 11 using a torque wrench or other suitable tool to measure the torque placed on the screws. The screws are torqued to a range of 45-75 in./lbs. At 45 in./lbs. the aluminum contact points on wedge 12 begin to permanently deform under the pressure of the bolts. Above 75 in./lbs. the stainless bolts will begin to strip. Preferably, the torque pressure is about 55 in./lbs. While wedge 12 and adaptor 11 are still attached after this deforming process, the backface contacting camera frame 9 is finished to create a face parallel to the back face (facing baseplate 28 ) of wedge 12 .
- Alignment and orientation may be maintained by fabricating each wedge 12 to include kinematic contact points w 1 , w 2 , and w 3 on the wedge face that faces opposing kinematic adaptor contact points a 1 , a 2 , and a 3 , respectively, on adaptor 11 .
- Kinematic contact points w 1 , w 2 , and w 3 are constituted in shape and size to contact kinematic contact points a 1 , a 2 , and a 3 to form a kinematic connection such that when the contact points of wedge 12 and adaptor 11 are joined, wedge 12 and adaptor 11 and their respective attached camera A components are thereby consistently placed and remain in the same alignment and orientation by way of the kinematic connection.
- alignment is meant that the components of camera A are aligned so that the center of each component when added to camera A is aligned along the center axis of camera system A.
- orientation is meant that the same contact points are attached to each other after the removal and reattachment of wedge 12 and adaptor 11 so that the same analogous sides of the various adaptor 11 and wedge 12 are oriented on the same side or face of camera A.
- the wedge contact points each have a different shape complementary to each opposing adaptor contact point.
- complementary is meant that when the sets of opposing contact points, e.g. a 1 and w 1 are joined together they will form a kinematic connection to restrain movement of wedge 12 and adaptor 11 and their attached components through the six degrees of freedom caused by environmental factors such as temperature changes, or other causes.
- kinematic contact point a 1 on adaptor 11 is releasably joined with complementarily shaped kinematic contact point w 1 on wedge 12 .
- FIG. 1C and FIG. 4 kinematic contact point a 1 on adaptor 11 is releasably joined with complementarily shaped kinematic contact point w 1 on wedge 12 .
- contact points a 2 and w 2 are complementarily shaped as part of the three point kinematic connection of wedge 12 and adaptor 11 .
- a plurality of wedges 12 will all have contact points w 1 , w 2 , and w 3 with the same size and shape enabling each different wedge 12 to form an even, aligned attachment to the same adaptor 11 . Therefore, while different wedges 12 may have different widths to accommodate lenses 15 having different lengths or circumferences, the three point union of any of the plurality of wedges 12 with the same adaptor 11 enables the different lenses 15 to be attached and detached from camera A without the need for recalibrating and/or realigning camera A.
- width is meant the distance between the two opposing faces of wedge 12 that contact attached components of camera A.
- this consistent alignment extends to the aligned attachment of camera A to any rack or other supporting system for camera A using lenses 15 that have different lengths or circumferences and wedges 12 having different widths that attach to baseplate 28 .
- Screws 24 are used to mount wedge 12 to baseplate 28 .
- Screws 19 fit into side slot 9 a on frame 9 and pass through holes in contact a 1 and into holes (not seen) in wedge contact point w 1 .
- Contact a 2 -w 2 and a 3 -w 3 are similarly joined together.
- Image receiving means 8 is releasably attached to frame 9 in a similar fashion to at least partly cover one camera frame orifice 9 b .
- Image receiving means 8 receives and processes the image data that passes through lens 15 and aperture 37 in shutter 30 as in any camera known in the art.
- Image receiving means 8 may be camera film or a sensor that receives light from the image and converts it into digitized image data which can be stored and processed at a later time. Such sensors are well known in the art.
- Image receiving means 8 includes input/output interface 31 (not seen in FIG. 2 ) connected to a computer or other control device, including but not limited to a human user, to control the operation of camera A.
- Frame 9 and/or cassette 7 possess interface(s) 35 to enable control signals to pass through to control operation of shutter 30 .
- Retaining ring 14 , glass plate 4 and lens baffle 10 all fit into frame 9 to hold lens 15 in alignment with image receiving means 8 and aperture 37 of shutter 30 . They may have different sizes and shapes for different lenses as will be recognized by those having skill in the art.
- FIG. 3 is an enlarged top perspective view of camera A showing the attachment of lens 15 to frame 9 to enable its alignment with camera A.
- Lens ears 15 a fit through cutouts 11 a on adaptor 11 and are held in place by screws 23 passing into alignment holes on frame 9 (not seen in FIG. 3 ). Because of the preferably close fit of ears 15 a into cutouts 11 a alignment of the lens with camera A is more easily maintained.
- FIG. 4 is a top perspective view of camera A showing the removal and replacement of shutter cassette 7 from camera A.
- Shutter 30 is inserted into the space defined by frame 9 and fastened by screws 21 .
- input/output connections 31 and 35 on image receiving means 8 and frame 9 respectively, which act to control the shutter mechanism. It can be seen that camera A remains intact and aligned when shutter cassette 7 is removed as the structural integrity of camera A does not depend on any of the components of shutter cassette 7 .
- a light tight seal (not seen in FIG. 4 ), such as an o-ring, at the camera-cassette interface prevents stray light from entering the camera.
- FIG. 5 is a side perspective view of shutter cassette 7 removed from camera A.
- Shutter complex 30 is a curtain or focal plane shutter that is positioned immediately in front of the focal plane of the camera, that is, directly in front of image receiving means 8 .
- One of the main advantages of focal-plane shutters is that the shutter can be built into the body of a camera which accepts different individual lenses 15 , eliminating the need for each lens to have an individual central shutter built into it.
- the focal-plane shutter is also a fairly simple mechanism which is capable of fast and accurate shutter speeds.
- FIG. 5A is a front view of shutter cassette 7 .
- FIG. 5B is a bottom view of shutter cassette 7 looking into cover 7 a .
- the two shutter components 33 and 34 of shutter 30 are seen as are input/output connection 35 and light seal 36 .
- FIG. 5C is a side view of shutter cassette 7 with cover 7 a removed showing shutter motor 40 . Suitable shutter motors 40 are well known to those having skill in the art.
- Opaque shutter curtains 33 and 34 travel across the film plane. For slower shutter speeds, the first curtain moves across the film plane and after the required time with the shutter open, the second curtain closes aperture 37 moving in the same direction. When the shutter is cocked again, shutter curtains 33 and 34 are moved back to their starting positions, ready to be released. Faster shutter speeds are achieved by the second curtain closing before the first one has fully opened. This results in aperture 37 having the form of a vertical slit that travels horizontally across the film. Faster shutter speeds simply require a narrower slit, as the speed of travel of the shutter curtains is not normally varied. Using this technique, cameras A are capable of shutter speeds of up to 1/2000 or 1/4000. Persons of skill in the art will recognize that other types of focal plane shutters may be used such as, but not limited to solid state liquid crystal shutters, iris shutters, and shutters utilizing rotating mirrors.
- shutter 30 shown in the instant application utilizes vertical travel shutters. These work in precisely the same way as horizontal shutters, but because of the typically shorter distance the shutter blades must travel and the faster shutter movement enabled by the preferred metal construction, the shutter blades can travel across the film plane in less time. Shutter 30 can reliably provide higher speeds (up to 1/8000 of a second). It will be recognized that camera A can utilize either horizontal- or vertical-travel curtain shutters.
- the camera design allows field maintenance of the camera system while maintaining both Interior Orientation and Exterior Orientation. It also enables the maintenance of the structural and environmental integrity of the camera system.
- Maintenance activities can typically involve (a) removing the camera from its hard-mount to the airframe, (b) changing or servicing the lens, and (c) changing or servicing the shutter.
- Exterior Orientation is the alignment of the cameras principal axis (pointing) over 3-angular and 3-positional (6 degrees of freedom) with respect to a fixed datum or image point.
- the design preserves EO using (a) rigid mechanical structures comprising the camera body (frame 9 ), lens mount baseplate 28 , wedge 12 , adapter 11 , and an image receiving means 8 , such as a digital image sensor, (b) a precision, pinned mount assembly for the lens, which relocates a lens to a high positional and angular accuracy, and (c) a kinematic 3-point mount between the camera system, in this case wedge 12 and a mounting/reference plate, in this case adaptor 11 , to enable remounting of the camera with high positional and angular accuracy and maintaining of the original accurate mounting position.
- Interior Orientation is a property of the camera system that describes the point-to-point transfer of image data from an emissive or reflective point in the subject scene being photographed or observed, to a point in the image recorded or captured in image receiving means 8 . It includes physical effects such as lens magnification, lens distortion, and sensor non-idealities (flatness, pixel areal response).
- the IO of a system is typically measured using a rigorous lab calibration process(es) known in the art, and is mathematically represented as a multidimensional polynomial or similar expression.
- the disclosed design preserves IO using (a) a vibration-resistant, athermal design of the lens body 15 , (b) lens 15 -to-camera frame 9 coupling, and (c) a removable shutter cassette 7 to allow field replacement of the shutter 30 .
- the preferred athermal design is created by using materials to construct the camera that have offsetting coefficients of expansion to create the athermal design by creating offsetting reactions to temperature changes. Therefore, when the temperature changes, the IO of the system is not changed by the expansion or contraction of the different components in camera A. Such athermal materials are well known to those having skill in the art.
- the cassette can be removed/installed without compromising the hermetic and light-tight seal of the camera system A. This is accomplished using an O-ring (or gasket) seal 36 on the cassette 7 -camera frame 9 interface.
- Cassette 7 can be removed/installed without compromising the interior orientation parameters of the camera system. This is accomplished by (a) placing focal plane shutter 30 very close to image receiving means 8 that is, at/near the lens conjugate plane thus minimizing any aperture effect on the lens transfer function and (b) constructing the camera body so that it does not depend on shutter 30 or the shutter mount (cassette 7 ) for any of it's mechanical rigidity or athermal properties.
- Typical image receiving means 8 include photographic film or image sensors or image sensor systems known in the art that allow for the digitization and storage of image data.
- cassette 7 design allows shutter 30 to be replaced without removing camera A from the hard mount to the airframe.
- cassette 7 can be removed from frame 9 without affecting the attachment of the other components of camera A to each other or baseplate 28 . This preserves EO even in the absence of a kinematic mount design. These properties allow for replacement of shutter cassette 7 in the field during an operation. Because EO and IO are maintained without depending on the shutter as a permanent component, shutter cassette 7 can be removed without the need for subsequent realignment or recalibration.
- FIG. 6 is a schematic view of a photographic imaging system B, such as an airborne mapping or reconnaissance system, which includes at least one and preferably an array of cameras A in operative connection with a microcontroller or sensor management unit (smu) 40 .
- operatively connected is meant that a component or device is connected either directly or indirectly to a second component and causes that second component to function.
- GPS global positioning sensor
- spatial sensor(s) 50 rigidly connected to either the cameras or a common rack holding the camera(s) to preclude motion between and also linked to smu 40 .
- the spatial sensor may be an Inertial Measurement Unit (IMU) the measures position and angular orientation.
- IMU Inertial Measurement Unit
- FIG. 7 depicts an array of cameras A arranged on a rack 60 and aligned at different angles to obtain images of a wide range of area or terrain.
- the rack is attached to an airborne vessel such as an airplane, balloon, etc. in such a manner that the orientation of the arrayed cameras is fixed into place for a particular operation although the orientation of one or more cameras can be changed for a different operation or a different phase of a particular operation.
- Smu 40 through its software or the intervention of a human user, directs the operation of the cameras A and can receive and store the images collected by the cameras A through image receiving means 8 .
- cameras A equipped with shutter cassette 7 enable a more efficient operation as they will allow for quick replacement of a faulty shutter in one camera A while the others can continue to operate. This replacement can take place on board an airborne vehicle or other mobile system carrier. Additional advantages exist in that multiple shutter cassettes 7 can be made available in the event of multiple shutter failures and that only replaceable cassettes 7 need be sent offsite for repair, not entire cameras or camera systems.
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US12/432,458 US7899311B1 (en) | 2008-04-29 | 2009-04-29 | Removable shutter for a camera |
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US12/432,458 US7899311B1 (en) | 2008-04-29 | 2009-04-29 | Removable shutter for a camera |
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US20130135522A1 (en) * | 2011-11-30 | 2013-05-30 | Samsung Electronics Co., Ltd. | Image photographing apparatus |
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US20140233937A1 (en) * | 2013-02-21 | 2014-08-21 | Canon Kabushiki Kaisha | Optical accessory adapter |
US9046759B1 (en) * | 2014-06-20 | 2015-06-02 | nearmap australia pty ltd. | Compact multi-resolution aerial camera system |
US9052571B1 (en) * | 2014-06-20 | 2015-06-09 | nearmap australia pty ltd. | Wide-area aerial camera systems |
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US9440750B2 (en) | 2014-06-20 | 2016-09-13 | nearmap australia pty ltd. | Wide-area aerial camera systems |
US9641736B2 (en) | 2014-06-20 | 2017-05-02 | nearmap australia pty ltd. | Wide-area aerial camera systems |
US10126127B2 (en) | 2016-04-29 | 2018-11-13 | Microsoft Technology Licensing, Llc | Athermalized mounting of inertial measurement unit |
US20190361194A1 (en) * | 2011-11-22 | 2019-11-28 | Cognex Corporation | Vision system camera with mount for multiple lens types and lens module for the same |
US10684362B2 (en) | 2011-06-30 | 2020-06-16 | The Regents Of The University Of Colorado | Remote measurement of shallow depths in semi-transparent media |
US11231502B2 (en) | 2011-06-30 | 2022-01-25 | The Regents Of The University Of Colorado | Remote measurement of shallow depths in semi-transparent media |
US11313678B2 (en) | 2011-06-30 | 2022-04-26 | The Regents Of The University Of Colorado | Remote measurement of shallow depths in semi-transparent media |
US11480850B2 (en) * | 2016-12-16 | 2022-10-25 | Nidec Copal Corporation | Optical unit |
US11508090B2 (en) * | 2021-03-22 | 2022-11-22 | Microsoft Technology Licensing, Llc | Methods for calibrating offset of optical center using kinematic mount |
US11933899B2 (en) | 2011-06-30 | 2024-03-19 | The Regents Of The University Of Colorado | Remote measurement of shallow depths in semi-transparent media |
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